Her obsessive ex is back in town, threatening the peace Hae-rin finally found. Desperate, she turns to the last person she ever would: Sunghoon, her long-standing rival. They are both attracted to each other, they just don't know it yet.

She never really liked him, but he always did. There will be obstacles, but he's willing to do anything to overcome them, just to get to her. A Brother's Best Friend trope ♡ Just to be clear, this is not my full version. I made several mistakes in this and will fix them. This is just my experimental fanfic. I will fix the mistakes in future chapters.